TDA7376B 2 x 35W POWER AMPLIFIER FOR CAR RADIO HIGH OUTPUT POWER CAPABILITY: 2 x 40W max./4Ω 2 x 35W/4Ω EIAJ 2 x 25W4Ω @ 14.4V, 1KHz, 10% DIFFERENTIAL INPUTS MINIMUM EXTERNAL COMPONENT COUNT INTERNALLY FIXED GAIN (26dB) MUTE FUNCTION (CMOS COMPATIBLE) AUTOMUTE AT MINIMUM SUPPLY VOLTAGE DETECTION STAND-BY FUNCTION NO AUDIBLE POP DURING MUTE AND STBY OPERATIONS CLIPPING DETECTOR WITH PROGRAMMABLE DISTORTION THRESHOLD PROTECTIONS: SHORT CIRCUIT (OUT TO GROUND, OUT TO SUPPLY VOLTAGE, ACROSS THE LOAD) OVERRATING CHIP TEMPERATURE WITH SOFT THERMAL LIMITER LOAD DUMP VOLTAGE FORTUITOUS OPEN GROUND LOUDSPEAKER DC CURRENT ESD MULTIWATT15 ORDERING NUMBER: TDA7376B DESCRIPTION The TDA7376B is a new technology dual bridge Audio Amplifier in Multiwatt 15 package designed for car radio applications. Thanks to the fully complementary PNP/NPN output stage configuration the TDA7376B delivers a rail-to-rail voltage swing with no need of bootstrap capacitors. Differential input pairs, that will accept either single ended or differential input signals, guarantee high noise immunity making the device suitable for both car radio and car boosters applications. The audio mute control, that attenuates the output signal of the audio amplifiers, suppresses pop on - off transients and cuts any noises coming from previous stages. The St-By control, that debiases the amplifiers, reduces the cost of the power switch. The on-board programmable distortion detector allows compression facility whenever the ampifier is overdriven, so limiting the distortion at any levels inside the presettable range. PIN CONNECTION (Continued) September 1998 1/9 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. TDA7376B BLOCK DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Value Unit V OP Operating Supply Voltage 18 V VS DC Supply Voltage 28 V Peak Supply Voltage (t = 50ms) 50 V Output Peak Current (non rep. t = 100µs) Output Peak Current (rep. f > 10Hz) 4.5 3.5 A A Vpeak IO Parameter Ptot Power Dissipation at Tcase = 85°C 36 W Tstg, Tj Storage and Junction Temperature –40 to 150 °C Value Unit 1.8 °C/W THERMAL DATA Symbol Rth j-case 2/9 Parameter Thermal Resistance Junction-case max. TDA7376B Figure 1: Differential Inputs Test and Application Circuit 1µF Figure 2: Single Ended Inputs Test and Application Circuit 1µF 3/9 TDA7376B Figure 3: Application Board Reference Circuit 1µF Figure 4: P.C. Board and Components Layout of the Circuit of Fig. 3 (1:1 scale) 4/9 TDA7376B ELECTRICAL CHARACTERISTICS (Refer to the test fig. 1 and 2 circuit, Tamb = 25°C; VS = 14.4V; f = 1KHz; RL = 4Ω; unless otherwise specified.) Symbol Parameter VS Supply Voltage Id Total Quiescent Drain Current Test Condition Min. Typ. 8 RL = ∞ Max. Unit 18 V 200 mA 120 mV VOS Output Offset Voltage PO Output Power THD = 10% 23 25 W Max. Output Power (*) VS = 14.4V 36 40 W 32 PO max EIAJ Output Power (*) VS = 13.7V THD Distortion PO = 0.5 to 10W CT Cross Talk f = 1KHz; Rg = 0 f = 10KHz; Rg = 0 R IN Input Resistance differential input single ended input 45 40 GV Voltage Gain differential input single ended input 25 25 PO EIAJ Channel Gain Balance Input Noise Voltage Rg = 600Ω; ”A Weighted” Rg = 600Ω; 22Hz to 22KHz SVR Supply Voltage Rejection f = 100Hz; Vr = 1Vrms; Rg = 0 f = 10KHz; Vr = 1Vrms; Rg = 0 45 BW (–3dB) 75 VCM = 1Vrms input referred 60 A SB Stand-by Attenuation VSB = 1.5V; POref = 1W 80 Vsb IN Stand-by in Threshold Vsb OUT Stand-by out Threshold Stand-by Current Consumption AM Mute Attenuation VM IN Mute in Threshold VM OUT Mute out Threshold I6 Mute pin Current D DL Distortion Detection Level (**) DDOUT Distortion Detector Output DC Current 26 26 27 27 dB 6 µV µV dB dB KHz dB 90 dB 1.5 V 100 µA 3.5 VM = 1.5V; POref = 1W V 85 dB 1.5 V 100 µA 3.5 V6 = 0 to VS, ; VS max. = 18V Output low, sinked current (Vpin10 = 1.5V) Output high, leakage current (Vpin10 = VS, @ VSmax = 18V) dB dB 1 55 Power Bandwidth % dB dB KΩ KΩ 3 4 Common Mode Rejection Ratio Isb W 0.3 80 70 ∆GV EN CMRR 35 0.03 V 3.5 % 1 mA 10 µA (*) Saturated square wave output (**) see figure 5 for THD setting. The TDA7376B is equipped with a programmable clipping distortion detector circuitry that allows to signal out the output stage saturation by providing a current sinking into an open collector output (DDout) when the total harmonic distortion of the output signal reaches the preset level. The desired threshold is fixed through an external divider that produces a proper voltage level across the THD set pin. Fig. 5 shows the THD detection threshold versus the THD set voltage. Since it is essential that the THD set voltage be proportional to the supply voltage, fig. 5 shows its value as a fraction of VCC. The actual voltage can be computed by multiplying the fraction corresponding to the desired THD threshold by the application’s supply voltage. 5/9 TDA7376B Figure 5: Clip Detector Threshold vs. THD set. Voltage. Figure 6: Quiescent Current vs. Supply Voltage R L = 4Ω V S = 14.4V R L = 4Ω f = 1KHz Figure 7: Quiescent Current vs. Temperature Figure 8: Ouput Power vs. Supply Voltage f = 1KHz THD = 1% R L = 3.2Ω RL = 4Ω RL = 4Ω Vi = 0 Figure 9: Ouput Power vs. Supply Voltage f = 1KHz THD = 10% Figure 10: EIAJ Power vs. Supply Voltage f = 1KHz Vi = 2.5Vrms RL = 3.2Ω RL = 3.2Ω RL = 4Ω 6/9 RL = 4Ω TDA7376B Figure 11: THD vs. Frequency Figure 12: THD vs. Output Power VS = 14.4V R L = 4Ω PO = 12W VS = 14.4V RL = 4Ω f (Hz) Figure 13: Dissipated Power & Efficiency vs. Output Power Figure 14: SVR vs. Frequency VS = 14.4V RL = 4Ω f = 1KHz Ri = 0 Ri = 600Ω VS = 14.4V RL = 4Ω Vr = 1Vrms f (Hz) Figure 15: CMRR vs. Frequency Figure 16: Crosstalk vs. Frequency VS = 14.4V R L = 4Ω PO = 1W RL = 0 V S = 14.4V R L = 4Ω V i = 1Vrms f (Hz) f (Hz) 7/9 TDA7376B mm DIM. MIN. TYP. inch MAX. MIN. MAX. A 5 0.197 B C 2.65 1.6 0.104 0.063 D 1 0.49 0.55 0.019 F 0.66 0.75 0.026 G G1 1.02 17.53 1.52 18.03 0.040 0.690 H1 H2 19.6 L 21.9 22.2 22.5 L1 21.7 22.1 L2 17.65 L3 17.25 L4 10.3 L7 M 2.65 4.25 M1 4.63 S 1.9 S1 Dia1 1.27 17.78 OUTLINE AND MECHANICAL DATA 0.039 E 8/9 TYP. 0.022 0.030 0.050 0.700 0.060 0.710 0.862 0.874 0.886 22.5 0.854 0.870 0.886 18.1 0.695 17.5 17.75 0.679 0.689 0.699 10.7 10.9 0.406 0.421 0.429 4.55 2.9 4.85 0.104 0.167 0.179 0.114 0.191 5.08 5.53 0.182 0.200 0.218 2.6 0.075 0.102 1.9 2.6 0.075 0.102 3.65 3.85 0.144 0.152 0.772 20.2 0.795 0.713 Multiwatt15 V TDA7376B Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1998 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com 9/9